Paper:	GP And: A Possible Alternate O - C Behaviour?
Volume:	335, The Light-Time Effect in Astrophysics: Causes and Cures of the O - C diagram
Page:	317
Authors:	Pop, A.; Turcu, V.; Moldovan, D.
Abstract:	The study of the pulsation period variability of the HADS star GP Andromedae is resumed on the basis of new CCD times of maximum light. The value of the relative period change rate estimated by us, from the available photoelectric data (57 ± 11) · 10−9 yr−1 is closer to the predicted value (1.6 · 10−9 yr−1 and 2.0 · 10−9 yr−1, respectively) than the previous estimates. However, the run of the O – C curve is further on better described by a cubic ephemeris, which suggests the possibility of the existence of an alternate period variation.

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